bisecting fixing commit since 14cfdbd39e316efd91ae6e403ef8211f0b022603 building syzkaller on 68660b21c27c417771037b3f1fe4aa072cfdeef9 testing commit 14cfdbd39e316efd91ae6e403ef8211f0b022603 with gcc (GCC) 8.1.0 kernel signature: e6c4446b523607e7999754a8b0e87f0c624108d75a3fcfc3d8f523ba6ebb83c8 run #0: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #1: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #2: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #3: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #4: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #5: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #6: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #7: OK run #8: OK run #9: OK testing current HEAD b3a99fd385fab59d0b8b4fdfb449c1e979accab8 testing commit b3a99fd385fab59d0b8b4fdfb449c1e979accab8 with gcc (GCC) 8.1.0 kernel signature: 6bdc12c6d144f2ed58b3311cb6256bb05979d485002538c8231adb12a165d8eb run #0: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #1: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #2: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #3: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #4: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #5: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #6: crashed: kernel BUG at net/sctp/sm_sideeffect.c:LINE! run #7: OK run #8: OK run #9: OK revisions tested: 2, total time: 39m30.504702262s (build: 17m19.22067394s, test: 21m23.997176951s) the crash still happens on HEAD commit msg: Linux 4.19.129 crash: kernel BUG at net/sctp/sm_sideeffect.c:LINE! batman_adv: batadv0: Interface activated: batadv_slave_1 IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready ------------[ cut here ]------------ kernel BUG at net/sctp/sm_sideeffect.c:1538! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 15906 Comm: syz-executor.4 Not tainted 4.19.129-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1538 [inline] RIP: 0010:sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] RIP: 0010:sctp_do_sm+0x3a42/0x5040 net/sctp/sm_sideeffect.c:1170 Code: 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 03 0f 8e d0 12 00 00 f6 83 b0 02 00 00 40 0f 85 7e e5 ff ff e9 a8 e5 ff ff <0f> 0b 49 8d 7d 12 48 89 fa 48 89 f9 48 c1 ea 03 83 e1 07 42 0f b6 RSP: 0018:ffff888067bcf6c8 EFLAGS: 00010246 RAX: ffff88808dcf68f0 RBX: ffff88808dcf6500 RCX: ffff88808dcf6b30 RDX: 1ffff11011b9ecfb RSI: 0000000000000012 RDI: ffff88808dcf67d8 RBP: ffff888067bcf980 R08: ffff888067bcf8a8 R09: ffff888091a6c568 R10: ffffed10127420f8 R11: ffff888093a107c7 R12: 0000000000000000 R13: ffff888067bcf8e8 R14: dffffc0000000000 R15: ffff888067bcf958 FS: 00007f5e690b4700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000b70004 CR3: 000000009b5e5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sctp_primitive_SHUTDOWN+0x7c/0xc0 net/sctp/primitive.c:104 sctp_close+0x354/0x750 net/sctp/socket.c:1560 inet_release+0xb4/0x1b0 net/ipv4/af_inet.c:427 inet6_release+0x46/0x60 net/ipv6/af_inet6.c:472 __sock_release+0xc2/0x290 net/socket.c:579 sock_close+0x10/0x20 net/socket.c:1140 __fput+0x249/0x7f0 fs/file_table.c:278 ____fput+0x9/0x10 fs/file_table.c:309 task_work_run+0x108/0x180 kernel/task_work.c:113 get_signal+0x13b5/0x1a30 kernel/signal.c:2399 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5e690b3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: fffffffffffffe00 RBX: 00007f5e690b46d4 RCX: 000000000045c849 RDX: 000000000000006e RSI: 0000000000000084 RDI: 0000000000000004 RBP: 000000000076bf00 R08: 0000000000000020 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000ade R14: 00000000004d7138 R15: 000000000076bf0c Modules linked in: ---[ end trace 0e8dccb975c90472 ]--- RIP: 0010:sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1538 [inline] RIP: 0010:sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] RIP: 0010:sctp_do_sm+0x3a42/0x5040 net/sctp/sm_sideeffect.c:1170 Code: 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 74 08 3c 03 0f 8e d0 12 00 00 f6 83 b0 02 00 00 40 0f 85 7e e5 ff ff e9 a8 e5 ff ff <0f> 0b 49 8d 7d 12 48 89 fa 48 89 f9 48 c1 ea 03 83 e1 07 42 0f b6 RSP: 0018:ffff888067bcf6c8 EFLAGS: 00010246 RAX: ffff88808dcf68f0 RBX: ffff88808dcf6500 RCX: ffff88808dcf6b30 RDX: 1ffff11011b9ecfb RSI: 0000000000000012 RDI: ffff88808dcf67d8 RBP: ffff888067bcf980 R08: ffff888067bcf8a8 R09: ffff888091a6c568 R10: ffffed10127420f8 R11: ffff888093a107c7 R12: 0000000000000000 R13: ffff888067bcf8e8 R14: dffffc0000000000 R15: ffff888067bcf958 FS: 00007f5e690b4700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558e22d6dad0 CR3: 000000009b5e5000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400